Comics Alliance gives us die hard Arkham fans some news on the plot, abilities, co-op mode, etc.
According to VG247's coverage:
The fenced-off area is five times the size of Arkham Asylum. Batman, obviously, doesn't like it: "He's been monitoring this place," said director Sefton Hill. "He's worried. He thinks it's a time-bomb waiting to explode into the streets of Gotham."
According to Chris Sims of Comics Alliance, Batman will also has a second zip line, "which he can shoot out while using the first: think classic Spider Man." Now that will make "zipping" around Arkham fun as hell.
So wipe the drool from your chin, take a deep breath and keep telling yourself it will be here soon. That's all we can do until we can get our hands on this future game of the year.